Bar stool



FIG. 1 is a perspective view of a bar stool showing my new design;

FIG. 2 is a front view;

FIG. 3 is a top plan view;

FIG. 4 is bottom view;

FIG. 5 is a left side view, the right side view being identical; and

FIG. 6 is a rear view. 

The ornamental design for a bar stool, as shown and described. 